PLATE 1 



EXPLA.NATION OF FIGURES 



1 Experiment 202. C. 11. Neutral red granules in different layers of the 

 corneal epithelium (adult frog) cultivated in plasma, 12 hours old. o, Granules in 

 the basal cells ; h, cells of a layer often recognizable between a and c; c, granules in 

 the cells of upper layer; d, cells of the uppermost layer, which show no activity. 

 X 450. 



2 Experiment 206. A. 3, showing neutral red granules in the moving epithelium, 

 a, endothelium, b, and below, those of connective-tissue cells; c, 24 hours old. 

 Culture in plasma. Movement (from left to right) of the ameboid border of the 

 epithelium, a, on the endothelial surface 6, is demonstrated. That the moving 

 epithelial membrane consists at least of two layers of cells is readily confirmed by 

 the types of granulation. Note the crescent-shaped arrangement of granules in 

 the basal cells. On the right, b, those of the endothelium are represented; the 

 contours of the cells are not visible. Connective-tissue cells (c) , the contours of 

 which are visible, show granules in their fine processes, too. As a rule, the 

 hyaline processes of the epithelium do not show any granules (see also figs. 3 and 

 4). The tissue was intensely stained (four days in the dye 1 : 200,000). X 250. 



3 Experiment 226. A. 2, showing phagocytic phenomenon of the corneal epi- 

 thelium, which are previously stained with neutral red; 24 hours old. Resemblance 

 of arrangement of melanin granules to that of neutral red is noticeable, a, Drawn 

 from a part of epithelium, moving on the endothelial surface of cornea; b, epithe- 

 lial cells of actively moving border. X 450. 



4 Experiment 236. 12. Phagocytosis of the epithelium to melanin and car- 

 min; 18 hours old. Culture in autoplasma, in which fine powdered carmin and 

 fresh melnin of iris were added. Drawn from a part of moving epithelial rim. 

 X 450. 



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